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Author Topic: 3 pop can mortars  (Read 1332 times)

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Offline 44magman

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3 pop can mortars
« on: February 25, 2013, 04:38:59 AM »

I just thought I would post a few pics of my latest project. 3 pop can mortars. 5 inch OD, with golf ball size powder chambers. Thanks GBO for all of the information and help to make these.
its a 1942 atlas lathe 8x36, home made steady rest, boring bar and altered bag ass drill bits. Its amazing what you can do on a lathe thats +70years old.
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Offline 44magman

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Re: 3 pop can mortars
« Reply #1 on: February 25, 2013, 04:52:13 AM »
I thought I knew how to post pics, will have to reread the directions and get back to you... sorry
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Offline Cannoneer

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Re: 3 pop can mortars
« Reply #2 on: February 25, 2013, 04:57:16 AM »
Welcome aboard, 44magnum. Keep trying with the pics, you'll get it.
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Offline 44magman

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Re: 3 pop can mortars
« Reply #3 on: February 25, 2013, 05:14:50 AM »
trying 30% reduction in preview
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Offline 44magman

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Re: 3 pop can mortars
« Reply #4 on: February 25, 2013, 05:24:53 AM »
more
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Offline 44magman

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Re: 3 pop can mortars
« Reply #5 on: February 25, 2013, 05:28:58 AM »
more
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Offline DieselNate

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Re: 3 pop can mortars
« Reply #6 on: February 25, 2013, 02:30:56 PM »
That is nice looking mortar so you are pressing in and welding a breech plug? I especially like the anti chatter device. Can't wait to see action videos and pictures. What are you making the base out of?
Nate
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Offline 44magman

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Re: 3 pop can mortars
« Reply #7 on: February 26, 2013, 04:00:24 AM »
Nope no welding breech plugs here. I wouldn't dare try my welding skills to that level of pressure. The three mugs started out as  a 2 foot long solid 1018 steel rod 5 inches in diameter.  I drill in one side about 6 inches deep leaving 1.725 inches from going through the bottom. I will tig weld the trunions on the bottom, but that comes much later.
I'll post a few more pictures in a day or two. right now I am using the boring bar to open up the insides to 2.68 diameter - 5 inches deep, and grinding/polishing out any tool marks. it really is BOARING work. ha ha
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Offline seacoastartillery

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Re: 3 pop can mortars
« Reply #8 on: February 26, 2013, 05:13:24 AM »
     Excellent project.  Excellent photos.  This is exactly the type of project that makes us want to sponsor this board!  What will the outside diameter look like?  Coehorn bands or straight cylinder?  Keep posting those photos and thanks for making the board a bit more interesting.

Mike and Tracy
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Offline 44magman

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Re: 3 pop can mortars
« Reply #9 on: February 26, 2013, 05:46:50 AM »
Oh bands of course, I am just eyeballing it I don't have exact plans. Here is a pic of my last one. Not the best pic, but only one I could find right now. I overbuilt that one.. I don't want an accident. That one was 6.25 inches across.


And here is my first GB cannon
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Offline 44magman

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Re: 3 pop can mortars
« Reply #10 on: March 01, 2013, 09:15:56 AM »
Boring the inside
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Offline 44magman

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Re: 3 pop can mortars
« Reply #11 on: March 01, 2013, 09:17:41 AM »
Gotta grind out tool marks and polish
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Offline 44magman

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Re: 3 pop can mortars
« Reply #12 on: March 01, 2013, 09:19:26 AM »
shaping outside and polishing
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Offline 44magman

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Re: 3 pop can mortars
« Reply #13 on: March 01, 2013, 09:21:39 AM »
here is how they look so far, done for the week. Ill be back to it next week.
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Offline 44magman

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Re: 3 pop can mortars
« Reply #14 on: March 20, 2013, 01:13:51 PM »
here is my progress so far
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Offline The Jeff

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Re: 3 pop can mortars
« Reply #15 on: March 20, 2013, 02:16:45 PM »
Nice looking mortars! Did you grind the curve into the trunnion entirely by hand? Or do most of it with a machine and just touch it up with a grinder?
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Offline 44magman

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Re: 3 pop can mortars
« Reply #16 on: March 20, 2013, 02:34:26 PM »
I used my HF mill drill 1/2 inch ruffing bit to hog out most and then went to the 4 1/2 inch grinder to fit it in tight.
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Offline JeffG

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Re: 3 pop can mortars
« Reply #17 on: March 20, 2013, 04:19:13 PM »
Nice work! Great lines!
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